When Parisian private investigator Aime Leduc picks up the phone one hot July afternoon, the call turns her life upside down. The voice on the other end, with its heavy German accent, belongs to a woman named Jutta Hald. Jutta claims to have shared a jail cell with Aimes long-lost mother, a suspected terrorist on Interpols most wanted list. If Aime wants to learn the truth about her mother, she is to meet Jutta at a rendezvous point in an ancient tower in the Sentier. But when Aime arrives, Jutta is dead, shot in the head at close range.

Aime realizes she has stumbled into something bigger than Jutta let on, and that her own life is in danger. She has a lot of unsolved mysteries in front of her: Jutta Halds murder, resurfaced materials from Sydney Leducs terrorist activities in the 1970s, police suppression of important information. The question is, can Aime put the pieces together before someone else ends up dead?